Beta Columbae
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Beta Columbae (β Columbae, abbreviated Beta Col, β Col), officially named Wazn Template:IPAc-en,[1] is the second-brightest star in the southern constellation of Columba.[2] It has an apparent visual magnitude of 3.1,[3] which is bright enough to be viewed with the naked eye even from an urban location. Parallax measurements place it at a distance of about Template:Convert from the Sun.[4]
Nomenclature
Beta Columbae is the star's Bayer designation. It has the traditional name Wazn (or Wezn) from the Arabic وزن "weight".[5][2] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[6] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[7] included a table of the first two batches of names approved by the WGSN; which included Wazn for this star.
In Chinese, Template:Lang (Template:Lang), meaning Son, refers to an asterism consisting of Beta Columbae and Lambda Columbae.[8] Consequently, Beta Columbae itself is known as Template:Lang (Template:Lang, Template:Langx.)[9]
Properties
The spectrum of Beta Columbae matches a stellar classification of K1 IIICN+1,[10] where the 'III' luminosity class indicates this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence of stars like the Sun. The notation 'CN+1' indicates a higher than normal level of cyanogen (CN) absorption in the atmosphere of the star.[11] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is Template:Nowrap,[12] which, at its estimated distance, equates to a physical radius of about 11.5 times the radius of the Sun.[13] Despite having expanded to this radius, Beta Columbae only has about a 10% greater mass than the Sun.[14] The outer envelope of this star is radiating energy at an effective temperature of 4,545 K,[15] resulting an orange[16] hue that is typical of a cool, K-type star.[17]
Beta Columbae has a high proper motion across the celestial sphere[18] and is moving at an unusually large speed of Template:Nowrap relative to the Sun.[2] About 107,200 years ago, it made a close approach to the Beta Pictoris system. The estimated separation of the two stars at this time was around Template:Convert and Beta Columbae may have perturbed outlying planetesimals within the debris disk surrounding Beta Pictoris.[18]
References
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- ↑ Template:Cite web
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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